esm222_12_colloids

esm222_12_colloids - 1 Bren School of Environmental...

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Unformatted text preview: 1 Bren School of Environmental Science & Management University of California, Santa Barbara Transport of Colloids in Saturated and Unsaturated Porous Media: Pore-scale Observation of Processes Arturo A. Keller, Sanya Sirivithayapakorn, & Maria Auset Bren School of Environmental Science & Management University of California, Santa Barbara Size Range of Various Particles Size Range of Various Particles .0 1 .0 1 .0 1 .0 1 .1 1 1 1 1 Size Range ( µ m) Colloids Molecules Macromolecules Viruses Bacteria Protozoa Gravel Sand Silt Clay Effective Pore Diameter Contaminants Bren School of Environmental Science & Management University of California, Santa Barbara Courtesy of Bruce Robinson, LANL Bren School of Environmental Science & Management University of California, Santa Barbara Saturated Saturated Zone Zone Vadose Vadose Zone Zone Leaking Sewer line Leaking Sewer line Or Septic tank Or Septic tank Contaminated Water Supply ? Contaminants Contaminants - Viruses Viruses- Bacteria Bacteria Bren School of Environmental Science & Management University of California, Santa Barbara Colloids in Groundwater Photo credit: A. F.P. Wil iams, U.S. EPA, http:/ www.epa.gov/nerlcwww/index.html B. Nannobacteria Research, http:/ www.msstate.edu/dept/geosciences/4site/nannobacteria.htm C. H.D.A Lindquist, U.S. EPA, http:/ www.epa.gov/nerlcwww/index.html 50 nm A B C Bren School of Environmental Science & Management University of California, Santa Barbara Viruses: bio Viruses: bio-nano nano-colloids colloids ¡ Two general shapes: ¡ icosahedral (twenty-sided) ¡ helical (a) (b) 2 Bren School of Environmental Science & Management University of California, Santa Barbara Virus morphology Virus morphology ¡ Composition ¡ Genome, either DNA or RNA ¡ Capsid protein: ¡ protect viral genome ¡ attach to specific receptor on host cell Bren School of Environmental Science & Management University of California, Santa Barbara Waterborne Human Viruses Waterborne Human Viruses Family Genera Note Picornaviridae Enterovirus Represent the largest fraction of viruses detected in water Cause Hepatitis A, digestive problems, juvenile diabetes, and poliomyelitis Reoviridae Reovirus Cause serious inflammation of Rotavirus mucous membrane of stomach and intestines in children Coronaviridae Coronavirus Cause serious bleeding in the intestines in children Caliciviridae Calcivirus Cause some intestinal problem Astrovirus in children Adenoviridae Mastadenovirus Cause diarrhea, respiratory&eye infection hepatitis non-A, non-B Bren School of Environmental Science & Management University of California, Santa Barbara Virus Contaminated Sewage Virus Contaminated Sewage Raw sewage Primary Secondary Tertiary WASTE WATER SLUDGE Ozone at 0.3 ppm for 2 min Hypochlorous...
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  • Spring '08
  • Keller
  • Colloid, Management University, Bren School, Bren School of Environmental Science & Management University of California

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esm222_12_colloids - 1 Bren School of Environmental...

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